HarmonyKeen End User License Agreement
Effective October 20, 2026 · Version 1.0.1
This is a legal agreement between you and Malsah Labs LLC (âweâ, âusâ, âourâ) covering the HarmonyKeen desktop application and its plugin versions, together with their files, updates, and documentation (the âSoftwareâ).
By installing or using the Software, you agree to this Agreement. If you do not agree, do not install or use the Software.
1. Who you bought from, and who licenses you
Two separate things happen when you buy HarmonyKeen, and they involve two different companies.
Polar Software, Inc. sells it to you. Polar is the merchant of record and our authorized reseller. Your purchase, your receipt or invoice, your payment method, and any tax charged are all handled by Polar under Polarâs own buyer terms. Your card statement will show a charge that reads POLAR* MALSAH-LABS POLAR.SH CA. Polar bills you as the seller, and Malsah Labs is us. Note that the product name HarmonyKeen does not appear on the statement line. Your bank may shorten or slightly reformat this text.
We license it to you. This Agreement governs your use of the Software, and it is between you and Malsah Labs LLC. We own the Software and grant you the rights described below.
If you have a question about a payment, a receipt, or a refund, that is a Polar matter. If you have a question about using the Software or about your license key, that is ours.
2. License grant
We grant you a personal, non-exclusive, non-transferable license to install and use the Software on computers you own or control, for your own use, subject to this Agreement.
This is a license, not a sale of the Software itself. We keep all rights we do not expressly grant here.
3. Your license key and your devices
Paid features are unlocked with a license key we email you after purchase.
Your license is for you, on the computers you own or control. Please do not share your key, and do not use a key you did not lawfully obtain.
The Software checks your license on your own computer, and there is no account to create. Once your license is on your machine you can work offline indefinitely: writing, generating and exporting never contact us.
The Software contacts us for three things, and only these three.
When you start the free trial. The trial is itself a license, and it comes from us, so the Software asks us for one the first time you generate harmony, after asking whether you want it. The trial runs for seven days from that first generation, not from when you installed, and there is one trial per computer: once a computer has had its trial we cannot issue it another. That request has to get through: if we cannot be reached, no trial starts, and the Software tells you so. Once the trial license arrives, the Software records the activation in the same way it does for a purchased one, described next.
When you activate a license, or move one to another computer. The Software tells us that the activation happened, so we can tell how widely a key is being used. If that message cannot be sent, activation still succeeds. It is a note for our records, not a permission check, and being offline never stops you activating or using the Software.
When you check for updates. If you have agreed to it, the Software asks us once a day whether a newer version exists. We ask your permission before this ever happens, it is off until you agree, and saying no is remembered. You can change your answer at any time in Settings, under General. Nothing installs unless you choose to install it.
The trial request carries only the scrambled machine code described in section 12. The activation record carries that code and your license identifier. The update check carries neither, and asks only for a file. None of them ever contains your files, your music, or anything you have made.
Your license covers the computers you own or control, as section 2 describes. Activate each one with the same key.
If you replace a computer, or add one, activate there. You do not need to ask us, wait for anything, or free anything up first.
4. What you may do
- Install and use the Software as described in section 2.
- Use everything you create with the Software for any purpose, including commercially. Your music is yours. We claim no rights in the harmonies, MIDI, or project files you make, and you owe us nothing for using them.
- Make a backup copy of the Software for your own archival use.
5. What you may not do
Except where this Agreement expressly allows it, where section 6 allows it, or where the law gives you a right that cannot be signed away, you will not:
- copy, distribute, resell, rent, lease, lend, sublicense, or otherwise make the Software available to other people;
- reverse engineer, decompile, or disassemble our own proprietary parts of the Software, or try to derive their source code;
- remove or alter any copyright, trademark, or other notices in the Software;
- work around or disable the license check or other technical protection measures;
- use the Software to build a competing product by copying its design or behavior.
6. Open source components you are free to modify
The Software includes open-source components. They are listed with their licenses in the app under About, then Open Source Licenses.
Two of them are licensed under the GNU Lesser General Public License version 2.1 or later, and the Software links to them dynamically: FluidSynth, and on Windows libsndfile.
Notwithstanding any other provision of this Agreement, this Agreement does not restrict, and shall not be construed to restrict, your rights under any LGPL-licensed library bundled with the Software, including but not limited to:
(a) the right to reverse engineer the Software for the limited purpose of debugging or substituting your own modifications to such LGPL libraries;
(b) the right to replace any LGPL-licensed library, including FluidSynth and libsndfile, distributed with the Software with your own modified version of that library; and
(c) the right to use such LGPL-licensed libraries in accordance with the terms of the GNU Lesser General Public License version 2.1 or later, the full text of which is included with the Software.
The restrictions in section 5 apply to our own proprietary code. They do not apply to the LGPL-licensed components, and they never apply in a way that would conflict with the LGPL.
7. Ownership
The Software, including its harmony engine, algorithms, design, and code, is owned by us and by our licensors, and is protected by copyright and other laws. All rights not expressly granted here are reserved.
8. Updates and upgrades
HarmonyKeen is a one-time purchase. There is no subscription.
Your purchase includes all version 1.x updates at no additional charge, for as long as we release them. That covers bug fixes, improvements, and new features within version 1.
A future major version, such as version 2, may be a paid upgrade. If we release one and you choose not to buy it, your license does not expire. You may keep using the most recent version 1.x release indefinitely.
9. Third-party components
The Software includes third-party open-source components under their own licenses, reproduced in the app under About, then Open Source Licenses. Those licenses govern those components. Where they conflict with this Agreement as to those components, those licenses control.
10. Refunds
We offer a 14-day refund on HarmonyKeen. If it is not working out for you, contact us within 14 days of purchase and we will arrange it.
Refunds are processed by Polar as the seller, under Polarâs buyer terms and the rules of the card networks. Polar may also issue a refund on its own initiative. Nothing here limits any refund or cancellation right you have under the law where you live.
If you receive a refund, your license ends and you should stop using the Software and delete your copies.
11. Your rights as a consumer
If you are buying as a consumer rather than for a business, you may have rights under the law of the country where you live that cannot be signed away by an agreement like this one.
Nothing in this Agreement removes or limits those rights. Where anything here conflicts with them, those rights apply and this Agreement gives way to the extent of the conflict. This includes any statutory cancellation or withdrawal period, and any implied guarantee about quality or fitness that your law does not allow us to exclude.
If you live in the EU or the UK, you normally have 14 days to withdraw from a distance purchase. For digital content delivered immediately, that right can end once delivery begins, if you agreed to that at checkout. Because Polar is the seller, Polar handles that process.
12. Privacy
The Software runs locally. Your melodies, projects, and generated harmonies stay on your computer, and we do not upload them.
To check your license on your own machine, the Software creates a one-way scrambled code derived from an identifier your operating system already provides. The original identifier is never stored or shared, and the scrambled code cannot be turned back into it. It does not name you, though because it sits beside your license we could connect the two for support, so our Privacy Policy treats it as personal information. That code is kept on your computer. As described in section 3, it is sent to us when you start a free trial, when you activate a license, and when you move a license to a different computer, and at no other time. It is not sent at any other time, it is not sent by the update check, and it is never sent while you are simply using the Software.
When you buy, Polar handles your payment details and we never see them. We do receive the email address you bought with, because that is how we send your license key.
Our full Privacy Policy is at harmonykeen.com/privacy.
13. No warranty
The Software is provided âas isâ, âwith all faultsâ, and âas availableâ, without warranty of any kind, whether express or implied, including any implied warranty of merchantability, fitness for a particular purpose, title, or non-infringement.
We do not promise the Software will be uninterrupted, free of errors, or suited to your particular needs. You use it at your own risk.
Some places do not allow warranties to be excluded, so parts of this section may not apply to you. Section 11 still applies.
14. Limitation of liability
To the maximum extent the law allows, we will not be liable for indirect, incidental, special, consequential, or punitive damages, or for lost profits, lost data, or lost goodwill, arising out of or relating to the Software or this Agreement.
Our total liability to you for any claim will not exceed the amount you paid for the Software.
The exclusion of indirect and consequential damages above is independent of every other remedy in this Agreement, and it continues to apply even if a limited remedy is found to have failed its essential purpose. A refund under section 10 is one route open to you, not your only one.
Nothing in this section limits our liability for fraud, willful misconduct, or gross negligence, for death or personal injury caused by our negligence, or for anything else the law does not permit us to limit. Some places do not allow certain limits, so parts of this section may not apply to you. Section 11 still applies.
15. Term and termination
This Agreement runs until it is terminated. It terminates automatically if you break it, and it ends if you take a refund.
When it ends, stop using the Software and delete your copies. Sections 5, 6, 7, 13, 14, 17, and 19 survive termination. Your rights under section 6 cannot be terminated by this Agreement, because they come from the LGPL and not from us.
16. Export and compliance
You agree to use the Software in line with applicable law, including export-control and sanctions law.
17. Governing law
This Agreement is governed by the laws of the State of Arizona, USA, without regard to its conflict-of-laws rules.
This Agreement is written in English. If it is translated, the English version controls.
If you are a consumer, this choice does not deprive you of the protection of the mandatory consumer laws of the country where you live, and you may bring proceedings in your local courts where your law gives you that right. See section 11.
18. The whole agreement, and changes to it
This Agreement, together with the open-source license terms shown in the app under About, then Open Source Licenses, is the entire agreement between you and us about the Software, and it replaces any earlier understanding.
We may update this Agreement for future releases. The version you accepted governs the version you installed. A new version of this Agreement does not change the terms for software you already have.
Your purchase itself is governed by Polarâs buyer terms, which are separate from this Agreement and which we do not control.
19. Severability
If any part of this Agreement is found to be unenforceable, that part applies only as far as the law allows, or is treated as removed if it cannot apply at all. The rest of this Agreement stays in force. Removing one part does not affect any other.
support@harmonykeen.com · harmonykeen.com
Malsah Labs LLC, Arizona, USA
Copyright Malsah Labs LLC. HarmonyKeen and the HarmonyKeen logo are trademarks of Malsah Labs LLC. Other product names may be trademarks of their respective owners.